<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>DB-&gt;set_heapsize()</title>
    <link rel="stylesheet" href="apiReference.css" type="text/css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
    <link rel="start" href="index.html" title="Berkeley DB C API Reference" />
    <link rel="up" href="db.html" title="Chapter 2.  The DB Handle" />
    <link rel="prev" href="dbset_h_nelem.html" title="DB-&gt;set_h_nelem()" />
    <link rel="next" href="dbset_heap_regionsize.html" title="DB-&gt;set_heap_regionsize()" />
  </head>
  <body>
    <div xmlns="" class="navheader">
      <div class="libver">
        <p>Library Version 11.2.5.3</p>
      </div>
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">DB-&gt;set_heapsize()</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="dbset_h_nelem.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 2. 
                The DB Handle
        </th>
          <td width="20%" align="right"> <a accesskey="n" href="dbset_heap_regionsize.html">Next</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="dbset_heapsize"></a>DB-&gt;set_heapsize()</h2>
          </div>
        </div>
      </div>
      <pre class="programlisting">#include &lt;db.h&gt;

int
DB-&gt;set_heapsize(DB *db,
    u_int32_t gbytes, u_int32_t bytes, u_int32_t flags);  </pre>
      <p>
        Sets the maximum on-disk database file size used by a database
        configured to use the Heap access method. If this method is never
        called, the database's file size can grow without bound. If this
        method is called, then the heap file can never grow larger than the
        limit defined by this method. In that case, attempts to update or
        create records in a Heap database that has reached its maximum size
        will result in a <code class="literal">DB_HEAP_FULL</code> error return.
    </p>
      <p>
        The size specified to this method must be at least three times the
        database page size. That is, a Heap database must contain at least
        three database pages. You can set the database page size using the 
        <a class="xref" href="dbset_pagesize.html" title="DB-&gt;set_pagesize()">DB-&gt;set_pagesize()</a>
        method.
    </p>
      <p>
         The <code class="methodname">DB-&gt;set_heapsize()</code> method may not be
         called after the <a class="xref" href="dbopen.html" title="DB-&gt;open()">DB-&gt;open()</a>
         method is called. Further, if this method is called on an existing
         Heap database, the size specified here must match the size used to
         create the database. Note, however, that specifying an incorrect
         size to this method will not result in an error return 
         (<code class="literal">EINVAL</code>) until the database is opened.
    </p>
      <p>
         The <code class="methodname">DB-&gt;set_heapsize()</code> <span>
            <span>
                  method returns a non-zero error value on failure and 0 on success.
            </span>
            
        </span>
    </p>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50399888"></a>Parameters</h3>
            </div>
          </div>
        </div>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp50409248"></a>gbytes</h4>
              </div>
            </div>
          </div>
          <p>
                  The size of the heap is set to <span class="bold"><strong>gbytes</strong></span> gigabytes plus <span class="bold"><strong>bytes</strong></span>.
             </p>
        </div>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp50398312"></a>bytes</h4>
              </div>
            </div>
          </div>
          <p>
                  The size of the heap is set to <span class="bold"><strong>gbytes</strong></span> gigabytes plus <span class="bold"><strong>bytes</strong></span>.
             </p>
        </div>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp50402672"></a>flags</h4>
              </div>
            </div>
          </div>
          <p>
                The <span class="bold"><strong>flags</strong></span> parameter is currently
                unused, and must be set to 0.
             </p>
        </div>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50412408"></a>Errors</h3>
            </div>
          </div>
        </div>
        <p>
             The <code class="methodname">DB-&gt;set_heapsize()</code> <span>
            <span>
                 method may fail and return one of the following non-zero errors:
            </span>
            
        </span>
        </p>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp50417216"></a>EINVAL</h4>
              </div>
            </div>
          </div>
          <p>
                  If the specified heap size was too small; the method was
                  called after <a class="xref" href="dbopen.html" title="DB-&gt;open()">DB-&gt;open()</a> 
                  was called; or if an invalid flag value or parameter was specified.
             </p>
        </div>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50418552"></a>Class</h3>
            </div>
          </div>
        </div>
        <p>
            <a class="link" href="db.html" title="Chapter 2.  The DB Handle">DB</a>  
        </p>
      </div>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp50413088"></a>See Also</h3>
            </div>
          </div>
        </div>
        <p>
             <a class="xref" href="db.html#dblist" title="Database and Related Methods">Database and Related Methods</a> 
        </p>
      </div>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="dbset_h_nelem.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="db.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="dbset_heap_regionsize.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">DB-&gt;set_h_nelem() </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> DB-&gt;set_heap_regionsize()</td>
        </tr>
      </table>
    </div>
  </body>
</html>
